Enumerable.Except(TSource) Method (IEnumerable(TSource), IEnumerable(TSource), IEqualityComparer(TSource))
Updated: October 2008
Produces the set difference of two sequences by using the specified IEqualityComparer(T) to compare values.
Assembly: System.Core (in System.Core.dll)
Type Parameters
- TSource
The type of the elements of the input sequences.
Parameters
- first
- Type: System.Collections.Generic.IEnumerable(TSource)
An IEnumerable(T) whose elements that are not also in second will be returned.
- second
- Type: System.Collections.Generic.IEnumerable(TSource)
An IEnumerable(T) whose elements that also occur in the first sequence will cause those elements to be removed from the returned sequence.
- comparer
- Type: System.Collections.Generic.IEqualityComparer(TSource)
An IEqualityComparer(T) to compare values.
Return Value
Type: System.Collections.Generic.IEnumerable(TSource)A sequence that contains the set difference of the elements of two sequences.
Usage Note
In Visual Basic and C#, you can call this method as an instance method on any object of type IEnumerable(TSource). When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).| Exception | Condition |
|---|---|
| ArgumentNullException | first or second is a null reference (Nothing in Visual Basic). |
If comparer is a null reference (Nothing in Visual Basic), the default equality comparer, Default, is used to compare values.
Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.